Abstract
Pumping station supplies water for technological process. The check valve in the station was replaced with a new one. The regular test of black out discovered the high pressure pulsations accompanied with noticeable pipeline movement of discharge pipe. It was caused by late check valve closing, probably, when the back flow reached the highest possible velocity. This statement was supported with analysis of results of pressure measurement near the check valve and with a numerical simulation of the flow in the pipeline system.
Highlights
Check valve is a necessary part of any pipeline delivering liquid from lower to upper place
Simulation showed that the system is designed well and pressure surge cannot appear with correctly working check valve
This paper describes investigation of real problem with the check valve slam
Summary
Check valve is a necessary part of any pipeline delivering liquid from lower to upper place. – pressure loss for maximal flow rate, – tightness and maintenance difficulty It means that check valve behaviour depends, besides its construction, on the pipeline system. The valve suffered from self-excited pressure pulsations, but in that case, the problems were not caused by check valve itself, but control valve in the different place of the system. Pressure pulsations described in the present paper are consequence of wrong behaviour of the check valve
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